Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eaef17fe54d1556…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 02:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01332571e2f868210560d7d032fbe627 SHA-1: 4b6742ee61273d9642f969cdfcde1e8e72c8ef21 SHA-256: 4eaef17fe54d155600fe0a502112eb0fe5f726e221cd0a107ee614b980f1c4fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=best+movie+download+sites+for+pc PDF link annotation
    • https://magnanelli.com/userfiles/file/89474612965.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/lusufimiru.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/36864765429.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/bikubisedudiwizet.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/71189460068.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/lipibiramemaxigi.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/42725383698.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/68652517614.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/mawutudomemuk.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/pumot.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/30986157235.pdfIn PDF document text
    • http://ingore.cn/upload/files/bifoxirafuwulosuj.pdfIn PDF document text
    • https://activepymes.com/pub/file/tibezavupalez.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/42125012973.pdfIn PDF document text
    • http://medrea.ru/upload/files/33764646294.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/54647602614.pdfIn PDF document text
    • http://potlista.com/file/files/87671766304.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///21561163591.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f291d21ec2---48539051216.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/11498759772.pdfIn PDF document text
    • https://birotex.rs/images/files/35550916412.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/fedijofosawebaberu.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/deriwuvifim.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/67913838529.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/46658330734.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136355d118fb---zewud.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109011651451651.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB3 10984 bytes
SHA-256: 262ad3f6c0ba52d291a7d28838807978e406e4a3df603bda5677105a8aa0cace
font_01_sfnt_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 16532 bytes
SHA-256: 354e0e0749ddafa326e46906fa3fa6242746ba418f36219728bec06cd4ed5420
font_02_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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